3 Answers
3

There is nothing wrong with your system: sudo apt-get update will only update the package list.
To really update packages, you have to type: sudo apt-get upgrade afterwards as well!

edit:
let me add to this that sudo apt-get upgrade will finish with Reading state information... Done
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded if you already have installed all latest updates. When you already have installed all updates for your system, sudo apt-get upgrade will not reinstall stuff. If you get a message along the lines of x packages have been kept back, you should run sudo apt-get dist-upgrade.

sorry sir but here no any downloaded packages are installed.
–
user160904May 22 '13 at 15:35

3

You can disagree with the answer, but it is factually accurate. Run sudo apt-get update and then also sudo apt-get upgrade. Think of it as the difference between 'checking for available updates' and then 'upgrading the available updates,' in a sense. He is correct.
–
gravityMay 22 '13 at 15:47

2

If you system is up to date already, nothing will be downloaded or updated with sudo apt-get update. Sometimes packages are held and you need to do sudo apt-get dist-upgrade, see the apt-get man page for details. If you are having a problem , post the error message or output, but I see nothing wrong or abnormal here.
–
bodhi.zazenMay 22 '13 at 16:02